Electric bell-sounding device for clocks



ELECTRIC BELL SOUNDING DEVICE FOR CLOCKS Filed. March 29, 1928 \ZO j [6/3 M fi 34- 6 23 IN VEN'TOIZJ '45 suitable me ans.

Patented June 24, 1936 U it '15,;

KENNETH e. WILLIAMS, or s1. rAuL, MINNESOTA ELECTRIC BELL-SOUNDING DEVICE FOR CLOCKS Application filed March 29, 1928. Serial No. 265,789.

' This invention relates to a new and improved device for sounding a hell or other alarm means such as used in clocks and comprises a part of my application for patent on electric clock Serial No. 194,069 filed May 25,

1927 in the United States Patent Office.

The object of the invention is to provide certain electrically operated .toll means for clocks either electrically or mechanically operated, as hereinafter set forth and as illus trated in the accompanying drawing, in which,

Fig. 1 is a schematic electric diagre m of my device and including the bell sounding means.

Fig. 2 is a vertical elevation of a clockwork frame, its time indicating bell, my device mounted in operative position, and some of the gear means of a clock pertaining particularly to the striking mechanism.

Referring to the drawing by reference numerals, 5 designates one of two main frame plates of a clock between which are mounted the usual gears, spring and other words ro-' tating the time indicating hands not shown. 6 is a so called striking gear with a shaft 7 journaled in the frameand a brace 8 fixed parallel thereto, said gear having a pinion 6P fixed adjacent to its inner side (not shown) meshing at certain times with an in- 0 termediate gear 9 rotated by a pinion 10 which is rotated by a main spring of the clock or other means (not shown). The latter pin- 3 ion is fixed on a shaft 11 and gear 9 is mounted on a shaft 12 both journaled suitably in the clock frame.

The striking gear 6 has the usual perimetral shallow teeth 6A and deep notches 6B which control the toll sounding means, usually released at the hour and half hour periods.

The pinion 6? with gear 6 does not mesh with gear 9 except when the bell sounding means are to be operated, being thrown into mesh with said gear 6 at these intervals by The teeth and notches of saidgear are engaged by the flat tooth 13 which is part of the clock mechanism described in said other application or equivalent means in spring driven clocks. When 59 said pinion 6P 1s meshed with the moving clock gear 9 at fixed intervals gear 6 is driven in left hand direction or as indicated by arrow 1 1 in Fig. 2 and tooth 13 rides on the gear teeth 6A until it drops into a notch 613, when the striking means, presently to be described cease to strike the bell 15, as said dropping of tooth 13 into a deep notch causes the gear 6 and its pinion 6A to be moved out of engagement from the gear 9 and remains idle until time for the next signal.

In Fig. 2 I have shown tooth 13 fixed to the under side of a lever 16 pivoted at 17 in the frame 5, said bar being of course oscillated vertically whenthe tooth 13 rides the teeth 6A. This oscillating movement causes circuit closing contact of acontact member 18, on outer end of bar 16 with another contact plate 19 close above it (see Fig. 2) both in a circuit energized by curren tric source designated 21.

pleted through said a double magnetic the upper part 2). charged by current chanical device to ri be described.

t from an contacts core 23 20 (see Fig. 1), plate 19 being y available elec- Circuit is comand a wire 22 to suit-ably fixed in of the clock frame (see Fig. The magnetic core is of course thus to operate a certain meng the bell 15 as will now bell hammer 24 at the lower end of an upright arm 25 fixed on a beam lever 26 fulcrumed on a horizontal shaft 27 in the upper part of a frame extension arm 5A a part of the frame and said lev in vertical plane.

tively right and left r pivoted to upper end pivoted to lower pa ends of said rods pivoted res right hand lever 2 both adapted to be osci t the upper central er 26 normally 28R and 28L are respeceach rods, one as 28B of lever 26 and 28L rt of said lever, the outer pectively to a and a left lever 29L llated in vertical plane each on a rock shaft 30 fixed one at each upper corner of with an inwardly the main frame 5. The free end of each lever (29R and 29L) is provided exposed metal block 31 nor mally in spaced relation but close to an end of the magnetic core It is now obvious ing current energizes t the plates or block s 31 are drawn inwar that when the alternathe magnetic core 23 dly alternately thlk oscillating the levers 29R-'29L alternately pulling the bars 28R r 28L and oscillating lever 26 which in turn oscillates shaft 27 and 25 is oscillated in a 5 vertical plane and its hammer 24 strikes the bell 15. Circuit is closed of course only whenthe tooth 13 rides the tops of the teeth 6A and is opened when it drops into-the spaces be tween the teeth or into a deep notch 6B.

10 32 represents a wall plug through which current is available via circuit wires 33 to 21 and from core 23 by wire 34.

I claim: c I In a bell striking device for clocks having a striking gear having a'toothed rim wit 1 the usual shallow and deep notches, an oscillatable arm with a tooth normall enga g in a deep notch of said rim of the stri ing gear, means 'for rotatin said gear and liftm said tooth at etermined intervals an said tooth adapted to ride over said shallow notches until it drops into the next deep notch; sounding means comprising a hammer fixed to the lower end of an oscillatable de- 25 pending arm suitably journaled to a rock shaft mounted in the upper part of the clock frame with said hammer in proximity to the clock bell, an electric circuit, a double magnetic core in said circuit and fixed in the clock frame, means associated with said oscillatable arm and in said circuit for closing and opening circuit to said magnetic core'to alternately magnetize its opposite ends and cause correspondin oscillation of said deending arm and bring the hammer to contact with t e sounding means. and means for oscillating the depending arm comprising a beam lever fixed in vertical plane on said rock shaft, a reach rod connected to each end of 7 40 said lever, each said reach rod pivotally connected at its outer end to a horizontally oscillatable lever, the free end of each said lever having a contact plate normally close to one end 0 said magnetic core.

In testimon whereof I aflix my signature.

, a K NNETH 'G. WILLIAMS. 

